Add resolv.conf and networking hooks

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

cmd/up.go

@@ -20,14 +20,27 @@ func runUp(_ *cobra.Command, _ []string) error {
 		pkg.Service{
 			Name:  "faas-containerd",
 			Env:   []string{},
-			Image: "docker.io/functions/figlet:latest",
+			Image: "docker.io/alexellis2/faas-containerd:0.2.0",
 			Mounts: []pkg.Mount{
 				pkg.Mount{
 					Src:  "/run/containerd/containerd.sock",
 					Dest: "/run/containerd/containerd.sock",
 				},
 			},
-		}}
+		},
+		pkg.Service{
+			Name:   "gateway",
+			Env:    []string{},
+			Image:  "docker.io/openfaas/gateway:0.18.7",
+			Mounts: []pkg.Mount{},
+		},
+		pkg.Service{
+			Name:   "prometheus",
+			Env:    []string{},
+			Image:  "docker.io/prom/prometheus:v2.14.0",
+			Mounts: []pkg.Mount{},
+		},
+	}
 
 	start := time.Now()
 	supervisor, err := pkg.NewSupervisor("/run/containerd/containerd.sock")

pkg/supervisor.go

@@ -3,9 +3,20 @@ package pkg
 import (
 	"context"
 	"fmt"
+	"log"
+	"os"
+	"os/exec"
+	"path"
+	"syscall"
+	"time"
 
 	"github.com/containerd/containerd"
+	"github.com/containerd/containerd/api/services/tasks/v1"
+	"github.com/containerd/containerd/cio"
+	"github.com/containerd/containerd/containers"
 	"github.com/containerd/containerd/namespaces"
+	"github.com/containerd/containerd/oci"
+	"github.com/opencontainers/runtime-spec/specs-go"
 )
 
 type Supervisor struct {
@@ -28,30 +39,163 @@ func (s *Supervisor) Close() {
 }
 
 func (s *Supervisor) Start(svcs []Service) error {
+	ctx := namespaces.WithNamespace(context.Background(), "default")
+
+	images := map[string]containerd.Image{}
+
 	for _, svc := range svcs {
 		fmt.Printf("Preparing: %s", svc.Name)
 
 		fmt.Printf("Pulling: %s\n", svc.Image)
-		bytesOut, err := pullImage(s.client, svc.Image)
+		img, err := pullImage(ctx, s.client, svc.Image)
 		if err != nil {
 			return err
 		}
-		fmt.Printf("Pull done for: %s, %d bytes\n", svc.Image, bytesOut)
+		images[svc.Name] = img
+		size, _ := img.Size(ctx)
+		fmt.Printf("Pull done for: %s, %d bytes\n", svc.Image, size)
+
+	}
+
+	for _, svc := range svcs {
+		fmt.Printf("Starting: %s\n", svc.Name)
+
+		image := images[svc.Name]
+
+		container, containerErr := s.client.ContainerService().Get(ctx, svc.Name)
+
+		if containerErr == nil {
+			taskReq := &tasks.GetRequest{
+				ContainerID: container.ID,
+			}
+
+			task, err := s.client.TaskService().Get(ctx, taskReq)
+
+			if task != nil && task.Process != nil {
+				zero := time.Time{}
+				fmt.Println(task.Process.ExitedAt, "=", zero)
+
+				if task.Process.ExitedAt == zero {
+					log.Println("need to kill", svc.Name)
+					killReq := tasks.KillRequest{
+						ContainerID: container.ID,
+						Signal:      uint32(syscall.SIGTERM),
+					}
+					em, err := s.client.TaskService().Kill(ctx, &killReq)
+					if err != nil {
+						return fmt.Errorf("error killing task %s, %s, %s", container.ID, svc.Name, err)
+					}
+					time.Sleep(1 * time.Second)
+					log.Println("em", em)
+				}
+
+				deleteReq := tasks.DeleteTaskRequest{
+					ContainerID: container.ID,
+				}
+				_, err = s.client.TaskService().Delete(ctx, &deleteReq)
+				if err != nil {
+					return fmt.Errorf("error deleting task %s, %s, %s", container.ID, svc.Name, err)
+				}
+
+			}
+
+			err = s.client.ContainerService().Delete(ctx, svc.Name)
+			fmt.Println(err)
+
+			err = s.client.SnapshotService("").Remove(ctx, svc.Name+"-snapshot")
+			fmt.Println(err)
+		}
+
+		mounts := []specs.Mount{}
+		if len(svc.Mounts) > 0 {
+			for _, mnt := range svc.Mounts {
+				mounts = append(mounts, specs.Mount{
+					Source:      mnt.Src,
+					Destination: mnt.Dest,
+					Type:        "bind",
+					Options:     []string{"rbind", "rw"},
+				})
+			}
+
+		}
+
+		wd, _ := os.Getwd()
+		resolv := path.Join(wd, "resolv.conf")
+		log.Println("Using ", resolv)
+		mounts = append(mounts, specs.Mount{
+			Destination: "/etc/resolv.conf",
+			Type:        "bind",
+			Source:      resolv,
+			Options:     []string{"rbind", "ro"},
+		})
+
+		hook := func(_ context.Context, _ oci.Client, _ *containers.Container, s *specs.Spec) error {
+			if s.Hooks == nil {
+				s.Hooks = &specs.Hooks{}
+			}
+			netnsPath, err := exec.LookPath("netns")
+			if err != nil {
+				return err
+			}
+
+			s.Hooks.Prestart = []specs.Hook{
+				{
+					Path: netnsPath,
+					Args: []string{
+						"netns",
+					},
+					Env: os.Environ(),
+				},
+			}
+			return nil
+		}
+
+		newContainer, containerCreateErr := s.client.NewContainer(
+			ctx,
+			svc.Name,
+			containerd.WithImage(image),
+			containerd.WithNewSnapshot(svc.Name+"-snapshot", image),
+			containerd.WithNewSpec(oci.WithImageConfig(image), oci.WithCapabilities([]string{"CAP_NET_RAW"}), oci.WithMounts(mounts), hook),
+		)
+
+		if containerCreateErr != nil {
+			log.Println(containerCreateErr)
+			return containerCreateErr
+		}
+		fmt.Println("created", newContainer.ID())
+
+		task, err := newContainer.NewTask(ctx, cio.NewCreator(cio.WithStdio))
+		if err != nil {
+			log.Println(err)
+			return err
+		}
+
+		exitStatusC, err := task.Wait(ctx)
+		if err != nil {
+			log.Println(err)
+			return err
+		}
+		log.Println("Exited: ", exitStatusC)
+
+		// call start on the task to execute the redis server
+		if err := task.Start(ctx); err != nil {
+			log.Println("Task err: ", err)
+			return err
+		}
 	}
 
 	return nil
 }
 
-func pullImage(client *containerd.Client, image string) (int64, error) {
-	ctx := namespaces.WithNamespace(context.Background(), "default")
+func pullImage(ctx context.Context, client *containerd.Client, image string) (containerd.Image, error) {
 
 	pulled, err := client.Pull(ctx, image, containerd.WithPullUnpack)
 
 	if err != nil {
-		return 0, err
+		return nil, err
 	}
-	bytesOut, _ := pulled.Size(ctx)
-	return bytesOut, nil
+
+	return pulled, nil
 }
 
 type Service struct {

resolv.conf

@@ -0,0 +1,2 @@
+
+nameserver 8.8.8.8